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Dermatophagia (from Ancient Greek δέρμα — lit. skin and φαγεία lit. eating) or dermatodaxia (from δήξις, lit. biting) is a compulsion disorder of gnawing or biting one's own skin, most commonly at the fingers.
Signs and symptoms Compulsive picking of the knuckles (via mouth) illustrating potentially temporary disfiguration of the distal and proximal joints of the middle and little fingers. The fingers have been compulsively picked and chewed in someone with excoriation disorder and dermatophagia.
Symptoms. Common symptoms in humans include: Nail biting; Pulling hair; Chewing fingers (in extreme cases, leading to amputation) Possible causes. This section will focus on the causes for autophagia in humans. There is no single primary cause for autophagia.
Onychotillomania is a compulsive behavior in which a person picks constantly at the nails or tries to tear them off. It is not the same as onychophagia, where the nails are bitten or chewed, or dermatillomania, where skin is bitten or scratched.
Frostbite is a skin injury that occurs when exposed to extremely low temperatures, causing the freezing of the skin or other tissues, commonly affecting the fingers, toes, nose, ears, cheeks and chin areas. Most often, frostbite occurs in the hands and feet. The initial symptoms are typically a feeling of cold and tingling or numbing.
Chigger and scabies bite symptoms. Undisturbed, chiggers might stay on the skin for three or four days before dropping off. Scabies, on the other hand, aren’t going anywhere.
Signs and symptoms. The index and middle fingers are most commonly affected and may present with redness, swelling and pain. Pus or discharge may be present.
Symptoms usually appear in late childhood or early adulthood between the ages of 15 and 30 years and will vary over the lifespan from flareups. More severe cases are characterized by dark crusty patches on the skin that are mildly greasy and that can emit a strong odor.
Body-focused repetitive behavior. Dermatillomania (picking of the skin) of the knuckles (via mouth), illustrating disfiguration of the distal and proximal joints of the middle and little fingers.
Russell's sign, named after British psychiatrist Gerald Russell, is a sign [1] defined as calluses on the knuckles [2] or back of the hand due to repeated self-induced vomiting over long periods of time.